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Plasma Display Panel Comprising Magnesium Oxide Protective Layer - Patent 7977883

VIEWS: 11 PAGES: 16

BACKGROUNDDescription of the Related Art A conventional protective layer of a PDP comprises double layers that are formed of coating a magnesium oxide powder on a magnesium oxide thin film, wherein the magnesium oxide powder is prepared by vapor deposition. In detail, the magnesiumoxide powder for forming the conventional protective layer is prepared by heating magnesium in a chamber and injecting and oxidizing an atmospheric gas, such as oxygen (O.sub.2), hydrogen (H.sub.2), or argon, into the chamber. The magnesium oxide powderprepared as described above has many defects and relatively many impurities. The present embodiments overcome the problems in the related art and provide additional advantages as well.SUMMARY Some embodiments relate to a MgO powder prepared by the method comprising: heating Mg in air to a temperature sufficient to generate Mg vapor; allowing the Mg to react with the air and become naturally oxidized to yield the MgO powder, whereinthe magnesium oxide powder has a first cathode-luminescence spectrum emission peak at a wavelength from about 300 nm to about 370 nm, and a second emission peak at a wavelength from about 600 to about 640 nm, and wherein the intensity ratio of the firstemission peak to the second emission peak is from about 1:0.4 to about 1:0.6. In some embodiments, the MgO comprises less than 2 ppm of each of nickel (Ni), iron (Fe), barium (B), silicon (Si), manganese (Mn), chrome (Cr), calcium (Ca), copper (Cu), zirconium (Zr), aluminum (Al), and sodium (Na). Some embodiments further comprise a third emission peak at a wavelength from about 700 nm to about 800 nm, wherein the intensity ratio of the first emission peak to the third emission peak is from about 1:0.25 to about 1:0.45. Some embodiments relate to a protective layer comprising: an MgO having a first cathode-luminescence spectrum emission peak at a wavelength from about 300 nm to about 370 nm, and a second emission peak at a wavelength from about 600 to about 640nm, a

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